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  • Five Effective Ways Where a Website Can Help Your Business to Grow and Expand

    The internet has brought significant changes to our ways of living, communication, marketing, and in ways of doing business today. There are major enhancements which we have been enjoying since the emergence of Internet where increase in speed and efficiency, cost saving, existence of virtual office and online courses are some of the major changes we have had over the last 20-30 years.

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  • [EF + Oracle] Inserting Data (Sequences) (2/2)

    - by JTorrecilla
    Prologue In the previous chapter we have see how to create DB records with EF, now we are going to Some Questions about Oracle.   ORACLE One characteristic from SQL Server that differs from Oracle is “Identity”. To all that has not worked with SQL Server, this property, that applies to Integer Columns, lets indicate that there is auto increment columns, by that way it will be filled automatically, without writing it on the insert statement. In EF with SQL Server, the properties whose match with Identity columns, will be filled after invoking SaveChanges method. In Oracle DB, there is no Identity Property, but there is something similar. Sequences Sequences are DB objects, that allow to create auto increment, but there are not related directly to a Table. The syntax is as follows: name, min value, max value and begin value. 1: CREATE SEQUENCE nombre_secuencia 2: INCREMENT BY numero_incremento 3: START WITH numero_por_el_que_empezara 4: MAXVALUE valor_maximo | NOMAXVALUE 5: MINVALUE valor_minimo | NOMINVALUE 6: CYCLE | NOCYCLE 7: ORDER | NOORDER 8:    How to get sequence value? To obtain the next val from the sequence: 1: SELECT nb_secuencia.Nextval 2: From Dual Due to there is no direct way to indicate that a column is related to a sequence, there is several ways to imitate the behavior: Use a Trigger (DB), Use Stored Procedures or Functions(…) or my particularly option. EF model, only, imports Table Objects, Stored Procedures or Functions, but not sequences. By that, I decide to create my own extension Method to invoke Next Val from a sequence: 1: public static class EFSequence 2: { 3: public static int GetNextValue(this ObjectContext contexto, string SequenceName) 4: { 5: string Connection = ConfigurationManager.ConnectionStrings["JTorrecillaEntities2"].ConnectionString; 6: Connection=Connection.Substring(Connection.IndexOf(@"connection string=")+19); 7: Connection = Connection.Remove(Connection.Length - 1, 1); 8: using (IDbConnection con = new Oracle.DataAccess.Client.OracleConnection(Connection)) 9: { 10: using (IDbCommand cmd = con.CreateCommand()) 11: { 12: con.Open(); 13: cmd.CommandText = String.Format("Select {0}.nextval from DUAL", SequenceName); 14: return Convert.ToInt32(cmd.ExecuteScalar()); 15: } 16: } 17:  18: } 19: } This Object Context’s extension method are going to invoke a query with the Sequence indicated by parameter. It takes the connection strings from the App settings, removing the meta data, that was created by VS when generated the EF model. And then, returns the next value from the Sequence. The next value of a Sequence is unique, by that, when some concurrent users are going to create records in the DB using the sequence will not get duplicates. This is my own implementation, I know that it could be several ways to do and better ways. If I find any other way, I promise to post it. To use the example is needed to add a reference to the Oracle (ODP.NET) dll.

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  • Microsoft Launches Pre-release Updates of AppFabric, BizTalk

    Microsoft Application Infrastructure Virtual Conference highlights integration between new cloud-savvy, .NET middleware and Microsoft's integration server....Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • SEO - The How and Why

    As the influence of social networking sites and the internet increases, focus of mankind is slowly shifting from real life to the virtual space and why not, it's fun, dynamic and cheap. So it wasn't long before businesses started recognizing the importance of online advertising.

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  • The Expectations of RIA Technologies in the Coming Future

    A rich Internet application (RIA) is a web application designed to distribute the features and functions usually connected with desktop applications. RIAs commonly divide the dispensation across the Internet and network segregate by locating the user interface and related activity and capability on the client side, and the data manipulation and operation on the application server side.

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  • How to Use Keywords Effectively

    If you don't know how to use keywords effectively, you'll definitely have a hard time succeeding in the virtual goods market or any online business. Keywords are an essential aspect of search engine optimization and online marketing.

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  • 6 Advanced OpenOffice.org Extensions

    <b>Linux Planet:</b> "The open source OpenOffice productivity suite is a cross-platform powerhouse, and you can can add additional functionality by installing extensions. Eric Geier offers six OpenOffice extensions for analyzing readability, special text effects, advanced math functions, and more."

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  • EMC VPlex Buyer's Guide

    With its recent release of VPlex, EMC is anything but quiet about its private cloud vision. At EMC World earlier this month, it elaborated on tis plans to go the distance with virtual storage.

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  • EMC VPlex Buyer's Guide

    With its recent release of VPlex, EMC is anything but quiet about its private cloud vision. At EMC World earlier this month, it elaborated on tis plans to go the distance with virtual storage.

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  • Unity --reset in 12.04 doesn't work

    - by Darr247
    I was trying to disable the 'global menu' feature in Unity, and Unity began to malfunction. I was unable to move windows, the left menu bar had disappeared, and the top panel was also gone. I couldn't open a terminal as I couldn't move windows to get to my shortcut. I used a virtual terminal(tty2), logged in, used sudo, and executed # unity --reset but it never finished. I have pasted the output here

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  • I upgraded ubuntu to 12.10, and the internet does not work on vbox

    - by user100607
    Last week, I upgraded my operating system to Ubuntu 12.10 from 12.04, and the internet stopped working on two virtual machines (launched with virtualbox), Windows XP and OSX Snow Leopard. OSX also stopped working completely at first, but I fixed that by switching to the 64 bit option in the vbox settings. I switching to bridged networking from NAT restored the internet to Windows, but not to OSX. Does anybody know what I could be doing wrong?

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  • Using macro to check null values [migrated]

    - by poliron
    My C code contains many functions with pointers to different structs as parameteres which shouldn't be NULL pointers. To make my code more readable, I decided to replace this code: if(arg1==NULL || arg2==NULL || arg3==NULL...) { return SOME_ERROR; } With that macro: NULL_CHECK(arg1,arg2,...) How should I write it, if the number of args is unknown and they can point to different structs?(I work in C99)

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  • Argument on Ranking of SEO Links

    SEO and link building can be a marketing tool considering the fact that the amount of traffic a site generates is a direct outcome of the links it has been given by the owner. Committed Link building is very essential for good standing of a virtual address.

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  • Conditional checks against a list

    - by AnnaSexyChick
    I was wondering how computers do this. The most logical way I can think is that they are iterating trough all elements of the list until they find one that matches the condition :) For example if you call function_exists(), PHP should iterate trough all defined functions until it meets the one that matches the name you're looking for. Is this true that this is the only way? If it is, it sounds like it's not very efficient :s

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  • Web Development Services - What's the Need?

    With the each passing day, Internet is becoming more and more popular and everyone wanting to have a strong online presence. The long established brick-and-mortar businesses have switched to virtual storefronts. Those who haven't done as yet, would soon face extinction.

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  • Cyber Stalkers and the Internet - Know the Dangers

    Many people perform a variety of functions on the internet. There';s nowhere else you can bank, pay bills, shop and meet people all with the click of a few buttons. The reason so many people choose th... [Author: Ed Opperman - Computers and Internet - June 14, 2010]

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